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Why do I pass out at random times during the year?

I am a 23 year old woman, I work out every day, running at least two miles per day. I have no other major health issues, but i have sudden blackouts throughout the year that come on without warning.Its scary, because i have small children and i am helpless when the blackouts occur, they last a minimum of 30 seconds.
No matter how young or old you are, blackouts should always be evaluated by a physician. Unfortunately your description of your blackouts are not detailed enough to narrow down the possible causes, but I will try to give you a few possibilities. One possibility is that you are experiencing orthostatic syncope. This is where your blood pressure drops upon standing up from a seated or lying position causing blood to fall from your head down towards your feet. The end result is lightheadedness, darkened vision, and passing out completely after standing up. There are many causes of this (too many to go through hear). Another possibility is that you are having seizures. People who have seizures can blackout for short periods of time. If the seizure is not witnessed, then there is no way to know that it happened. I suggest that you schedule an appointment with your primary care physician. He or she can perform tests of your blood pressure and heart rate while standing and sitting which will help tell if you have a problem with orthostasis. Your doctor may also order a tilt table test which can help tell what's causing these blackouts. No matter what the results, you may need an echocardiogram and a brain MRI to make sure there are no other problems going on. You may warrant referral to a cardiologist or neurologist depending on what is found on these tests. Good luck.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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